>> well, what we did was we did a public records request in mexico, using their public records law. we got thousands and thousands of serial numbers of seizures of the defense ministry of weapons they had seized. they took those serial numbers and compared them to the serial numbers of a list of fast and furious guns that they also obtained and we got 96 exact matches. then we took those 96 exact matches sw cross referenced them with the list of around 122 guns that congress had and also serial numbers that the mexican government had made available through press releases. and we got that number, 57 unknown weapons. >> you also conclude d that mexican officials knew about fast and furious long before they admitted it. >> yes. we found that through sources and documentation, there was a mexican justice official station in the atf phoenix field division, atf office that ran fast and furious. and this official was there many months before the operation began and didn't leave until it was over. he was experienced with atfs weapons tracking databases and the tracking system. he was also o